EP0635370B1 - Un système d'impression d'encre - Google Patents

Un système d'impression d'encre Download PDF

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Publication number
EP0635370B1
EP0635370B1 EP94304311A EP94304311A EP0635370B1 EP 0635370 B1 EP0635370 B1 EP 0635370B1 EP 94304311 A EP94304311 A EP 94304311A EP 94304311 A EP94304311 A EP 94304311A EP 0635370 B1 EP0635370 B1 EP 0635370B1
Authority
EP
European Patent Office
Prior art keywords
air
printing system
nozzles
ink printing
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94304311A
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German (de)
English (en)
Other versions
EP0635370A1 (fr
Inventor
Chandrakant R. Bhatia
Steven S. Kuhlin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Videojet Technologies Inc
Original Assignee
Videojet Systems International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Videojet Systems International Inc filed Critical Videojet Systems International Inc
Publication of EP0635370A1 publication Critical patent/EP0635370A1/fr
Application granted granted Critical
Publication of EP0635370B1 publication Critical patent/EP0635370B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0022—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using convection means, e.g. by using a fan for blowing or sucking air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes

Definitions

  • the invention relates to an ink printing system and, more particularly, to an improved device for drying the ink jet images.
  • Ink printing systems that utilise ink jet printers find application in a wide variety of printing applications.
  • One such application is the printing of images, such as expiration dates and lot numbers, on cans, bottles and the like, on high speed automated production lines.
  • the cans or bottles are filled with product, capped and labelled.
  • the labelling process includes the application of the ink jet images directly to a surface of the cans and bottles and/or the labelling therefor. Because the ink jet imaging process occurs as part of the high speed operation of the production lines, it must be carried out rapidly and efficiently, i.e. the images must be applied and dried for further handling in a matter of seconds.
  • the ink jet printers used in these high speed applications typically include an ink jet nozzle having an orifice providing a stream of ink.
  • a piezoelectric device surrounds and acts upon the nozzle to cause the formation of drops as the ink leaves the nozzle orifice.
  • the drops are selectively charged by a charging electrode and pass through a deflection field.
  • the deflection field is created by opposed upper and lower electrodes where one electrode is connected to a power supply and the other electrode is grounded, or connected to a power supply of opposite polarity.
  • the deflection field deflects selected drops to cause them to strike the substrate being marked, i.e. the can or bottle, to create a desired ink jet image.
  • the ink drops applied to the substrate i.e. the can, bottle, or paper labelling
  • the substrate i.e. the can, bottle, or paper labelling
  • the wet ink presents handling problems in that the wet ink can be easily smeared, or smudged.
  • Known ink jet image driers typically consist of a heating element and blower positioned downstream of the printing station.
  • the blower forces air over the heating element and onto the newly printed image.
  • the blowers used in this process typically move the air at low pressure and high volume, i.e. of the order of 0.047 m 3 /sec to 0.094 m 3 /sec (100 to 200 cubic feet per minute), to transfer the heat to the printed image by convection and/or radiation.
  • a disadvantage of this process is that it utilizes a large amount of air and electrical energy and is relatively inefficient and slow. As a result of this, the operating cost of the drier is relatively high. Furthermore, because a large volume of hot air is used, the metal components that form part of production line are exposed to the heated air and become extremely hot resulting in a safety hazard. Moreover, if the production line stops for any reason, the stationary product in front of the heater is heated, by the radiating heat, to a level that could damage the product, or in the case of paper, could start a fire. Finally, the blowers used in this process are large and noisy.
  • EP-A-0364425 discloses a drying section equipped with blowing nozzles, each of which is intended to direct an air stream onto print material carrying wet print.
  • blowing nozzles each of which is intended to direct an air stream onto print material carrying wet print.
  • respective nozzles are located at a distance of less than 10 mm from the print, and the velocity of the air stream adjacent respective nozzles exceeds 100 m/sec, the time duration of the air streams being shorter than 10 sec, preferably between 1 and 5 sec for surface drying the wet print.
  • the invention provides an ink printing system for applying an inked image to a substrate including a dewatering device for removing moisture from the substrate, a printhead for applying the inked image to the substrate, a drier for drying the inked image on the substrate and means for moving the substrate past the dewatering device, the printhead and the drier, characterised in that, the drier comprises an air chamber including a plurality of nozzles in communication therewith, for directing air at the inked image on the substrate, and means for delivering air under pressure to said chamber, in that the nozzles are adapted to deliver the air at the inked image at high velocity and low volume and in that the nozzles are angled ( ⁇ ) such that the air has a velocity component in the direction of travel of the substrate, effecting an increase in the period of time during which the air contacts the area of the substrate to be dried.
  • the drier comprises an air chamber including a plurality of nozzles in communication therewith, for directing air at the inked image on the substrate, and means for
  • the angle ( ⁇ ) of the nozzles can be in the range 0 and 25 degrees relative to a line perpendicular to the direction of travel of the substrate.
  • the nozzles are at an angle (B) relative to the horizontal to control the direction in which the air moves after contacting the substrate and to thereby control the width of the heated area.
  • angle (B) is approximately 25 degrees relative to the horizontal.
  • the velocity of the air can be in the range 25.4 m/sec and 50.8 m/sec (5,000 and 10,000 feet per minute) and the volume of air moved can be in the range 0.00047 m 3 /sec and 0.0047 m 3 /sec (1 and 10 cubic feet per minute).
  • the air directed at the inked image is heated to a temperature in the range 37.7 °C and 316° C (100 and 600 degrees Fahrenheit).
  • the heating can be effected by a heating element located either in, or outside, the chamber.
  • the system further includes means for regulating the pressure of the air delivered to the chamber thereby to control the speed of air from the nozzles.
  • the ink jet image drier consists of a plurality of nozzles that direct a small volume of air onto the printed image at a high velocity.
  • the air velocity is maintained as high as possible without disturbing the wet ink image.
  • the specially designed nozzles of the invention allow the air to be delivered to the printed image area without warming the entire area.
  • the air so delivered, while it must be dry, does not have to be heated to effectively dry the image.
  • the drying time can, if desired, be reduced by increasing the air temperature.
  • the use of high velocity air creates what is known as "skin effect", where the outer surface of the ink is quickly dried such that the ink image can be handled thereafter.
  • the ink jet printer section of a bottle filling production line is diagrammatically illustrated in Figures 1 and 2 of the accompanying drawings.
  • the production line consists of a conveyor 1 for moving bottles 2 at high speed past a print head 6 and ink jet image drier 8 of the ink jet printer, in the indicated direction. While the illustrated embodiment of the invention shows a bottle filling production line, it will be appreciated, by persons skilled in the art, that the drier 8 could be used with any substrate on which ink is printed, such as, cans, cartons, packaging and the like.
  • the conveyor 1 moves at a speed of 0.51 m/sec to 1.02 m/sec (100 to 200 feet per minute), or more, such that 600 bottles per minute are handled by the production line.
  • a dewatering device 4 such as that disclosed in U.S. Patent No. 5,173,988 issued to Bhatia.
  • the dewatering device 4 creates a clean, warm, dry surface on which the ink jet printer is to print an image.
  • the bottles pass ink jet printer printhead 6.
  • the print head applies the desired ink image to the bottles, as has been previously described.
  • the bottles with the wet ink jet image printed thereon then immediately pass the drier 8 of the present invention.
  • the drier 8 consists of an air tight housing 10 defining a hot air chamber 12 therein.
  • Chamber 12 communicates with a plurality of small air nozzles 14 such that air delivered to the chamber 12 under pressure will exit via nozzles 14 at high speed.
  • the nozzles 14 are disposed along the entire length of drier 8 such that the bottles will be contacted by the air for the length of drier 8, as they are moved by conveyor 1.
  • Heating element 16 Located within chamber 12 is a heating element 16 (See Figures 3 and 5 of the accompanying drawings).
  • Heating element 16 can consist of a coil, or other controllable heater, capable of heating the air in the chamber 12 to a temperature which is preferrably in a range of between 66°C and 204°C (150 and 400° F), or higher.
  • the air is delivered to chamber 12, under pressure, via air inlet line 18.
  • the location of the air inlet line 18 is such that the air passes through the interior of heating element 16 before entering chamber 12.
  • Other suitable arrangements of the heating element and air inlet can be used provided the air is suitably heated.
  • the air can be supplied to air inlet 18 by a compressor 20, or other suitable air source.
  • a regulator 22 is provided to control the pressure and flow rate of the air delivered to inlet 18.
  • the air is delivered to the nozzles 14, under pressure, at a pressure in the range 34.47 kPa to 413.64 kPa (5 to 60 psia).
  • the air pressure is maintained at a pressure of between 137.8 kPa and 344.7 kPa (20 and 50 psia) and the velocity of the air leaving nozzles 14 is preferably in the range 25.4 m/sec to 50.8 m/sec (5,000 to 10,000 feet per minute).
  • the drier 8 of the present invention is adapted to move a volume of air of approximately 0.0024 m 3 /s (5 cubic feet per minute).
  • the velocity of the air is adjusted by regulating the air pressure in chamber 12 via regulator 22. It is desired to maintain the air velocity as high as possible to maximize drying without physically disturbing the ink drops on the surface of the substrate, i.e. the bottles 2.
  • the specific maximum velocity of the air that can be used depends upon the type of ink, size of the drops and the type of substrate surface.
  • the nozzles 14 are angled, as shown by an angle ⁇ , in Figure 2 of the accompanying drawings, relative to a line perpendicular to the direction of travel of bottles 2.
  • the value of angle ⁇ can be between 0 and 25 degrees.
  • the angling of the nozzles provides a velocity component in the direction of travel of the bottles such that the time, during which the air stream contacts the bottle, is increased.
  • the use of the angled nozzles 14 also directs the air away form the printhead 6 to minimize any adverse effect of the air on the printing process.
  • the drier 8 is mounted such that the nozzles 14 are also at a preferred angle of approximately 25 degrees relative to the horizontal, as shown by an angle B.
  • the drier 8 is angled in order to control the direction the air moves after hitting the bottle 2 and thereby control the width of the area heated by the air such that the entire bottle 2 is not heated.
  • the nozzles 14 are, in the preferred embodiment, spaced form the passing substrate 2 by approximately 0.48 cm to 0.64 cm (0.19 to 0.25 inches) for maximum results, as shown at 'l' in Figure 3 of the drawings.
  • the speed of drying is affected by three factors: 1) the velocity of air, 2) the time the ink is exposed to the air, and 3) the temperature differential between the ink and the air.
  • the air temperature and velocity can be controlled by controlling the heating element 16 and the pressure of the air via regulator 22.
  • the amount of time the ink is exposed to the air is dependent on two factors: 1) the length of drier 8 and 2) the speed at which the bottles 2 are moved by conveyor 1. Because the conveyor speed is determined by the bottle filling operation, or the like, and cannot normally be altered, the time the ink is exposed to the air will depend on the length of the drier 8.
  • the drier 8 in a preferred embodiment, is 28 cm (11 inches) long.
  • the ink can be exposed to the air for a longer period of time by increasing the length of the drier 8, or by using additional driers, arranged in series with the illustrated drier 8.
  • the angling of the nozzles 14 also increases the exposure time, as previously described.
  • the design of the drier of the present invention enables the operator to control the three factors that control drying time quickly and easily to maximize the effectiveness of the system for each application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Ink Jet (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (14)

  1. Système d'impression par de l'encre destiné à appliquer une image d'encre sur un substrat, comprenant un dispositif de déshydratation destiné à retirer l'humidité du substrat, une tête d'impression destinée à appliquer l'image d'encre sur le substrat, un sécheur destiné à sécher l'image d'encre sur le substrat, et un dispositif de déplacement du substrat le long du dispositif de déshydratation, de la tête d'impression et du sécheur, caractérisé en ce que le sécheur (8) comporte une chambre (12) d'air qui possède plusieurs buses (14) en communication avec la chambre et destinées à diriger de l'air sur l'image d'encre portée par le substrat (2), et un dispositif de distribution de l'air sous pression à la chambre (12), en ce que les buses (14) sont destinées à transmettre l'air à l'image d'encre à grande vitesse et avec un faible volume, et en ce que les buses (14) sont inclinées d'un angle (α) tel que l'air a une composante de vitesse dans la direction de déplacement du substrat (2) et qui assure une augmentation de la période pendant laquelle l'air est au contact de la surface du substrat (2) qui doit être séchée.
  2. Système d'impression par de l'encre selon la revendication 1, caractérisé en ce que les buses (14) sont inclinées d'un angle (α) compris entre 0 et 25° par rapport à une perpendiculaire à la direction de déplacement du substrat (2).
  3. Système d'impression par de l'encre selon la revendication 1 ou 2, caractérisé en ce que les buses (14) forment un angle (B) par rapport à une horizontale pour régler la direction dans laquelle l'air se déplace après être venu au contact du substrat (2) et règle ainsi la largeur de la zone chauffée.
  4. Système d'impression par de l'encre selon la revendication 3, caractérisé en ce que les buses (14) forment un angle (B) d'environ 25° par rapport à une horizontale.
  5. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que la vitesse de l'air dirigé sur l'image d'encre est comprise entre 25,4 et 50,8 m/s (5 000 et 10 000 pieds par minute).
  6. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que le volume de l'air distribué par les buses (14) est compris entre 0,00047 et 0,0047 m3/s (1 et 10 pieds cubiques par minute).
  7. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que l'air est chauffé.
  8. Système d'impression par de l'encre selon la revendication 7, caractérisé en ce que l'air est chauffé à une température comprise entre 37,7 et 316 °C (100 et 600 °F).
  9. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que l'air est distribué aux buses (14) sous une pression comprise entre 37,47 et 413,64 kPa (5 et 60 psia).
  10. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un élément de chauffage (16) est placé dans la chambre (12).
  11. Système d'impression par de l'encre selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'un élément de chauffage est placé à l'extérieur de la chambre (12).
  12. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que le système comporte en outre un dispositif (22) de régulation de la pression de l'air distribué à la chambre (12) de manière que la vitesse de l'air provenant des buses (14) soit réglée.
  13. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que l'air crée un effet de peau sur l'encre tel que la surface externe des gouttelettes est séchée la première.
  14. Système d'impression par de l'encre selon l'une quelconque des revendications précédentes, caractérisé en ce que les buses (14) s'inclinent du côté opposé à la tête (6) de l'imprimante à jets d'encre.
EP94304311A 1993-07-20 1994-06-15 Un système d'impression d'encre Expired - Lifetime EP0635370B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94457 1993-07-20
US08/094,457 US5517214A (en) 1993-07-20 1993-07-20 Ink jet image drier

Publications (2)

Publication Number Publication Date
EP0635370A1 EP0635370A1 (fr) 1995-01-25
EP0635370B1 true EP0635370B1 (fr) 1998-03-18

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EP94304311A Expired - Lifetime EP0635370B1 (fr) 1993-07-20 1994-06-15 Un système d'impression d'encre

Country Status (6)

Country Link
US (1) US5517214A (fr)
EP (1) EP0635370B1 (fr)
JP (1) JPH0752373A (fr)
AT (1) ATE164119T1 (fr)
CA (1) CA2124988C (fr)
DE (1) DE69409043T2 (fr)

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DE4021227A1 (de) * 1990-07-04 1991-06-06 Siemens Ag Vorrichtung zum trocknen von aufzeichnungstraegern in tintendruckeinrichtungen
US5173988A (en) * 1991-06-17 1992-12-29 Videojet Systems International, Inc. Dewatering apparatus for drop marking bottles and cans

Also Published As

Publication number Publication date
ATE164119T1 (de) 1998-04-15
CA2124988A1 (fr) 1995-01-21
DE69409043D1 (de) 1998-04-23
CA2124988C (fr) 1999-09-21
DE69409043T2 (de) 1998-07-02
JPH0752373A (ja) 1995-02-28
EP0635370A1 (fr) 1995-01-25
US5517214A (en) 1996-05-14

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